New chain problem

Discussion in 'Cycling Equipment' started by mdgeorge, May 23, 2013.

  1. mdgeorge

    mdgeorge New Member

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    I've just replaced a chain with a one that has exactly the same number of links as the original. However when I turn pedals the chain slightly misses one of the teeth on the lower derailer cog every third revolution of the pedals. Any suggests why this may be occurring or solutions.

    Thanks
     
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  2. daveryanwyoming

    daveryanwyoming Well-Known Member

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    I take it you're talking about skipping on the derailleur pulleys not an actual cassette cog?

    I'd suspect that you waited too long to replace your worn out chain and it had stretched a bit as they do when the rollers and pins wear from use. Run a stretched chain for too long and the most used cassette cogs will also wear to match the elongated chain and then when you put a new chain on there can be mismatch problems. The derailleur pulleys are usually much softer plastic and will wear even more quickly so if you did run your old chain past the point where it had elongated it's likely you wore one or both derailleur pulleys in such a way that it doesn't cleanly mesh with the new chain.

    If so, I'd replace the derailleur pulleys.

    It could be something else but based on your description that would be my best guess.

    -Dave
     
  3. danfoz

    danfoz Well-Known Member

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    If not using one of the quick release/install chain links (master link) I'm guessing it's happening where the chain was joined. If so it's probably a stiff link and can be worked back and forth a bit between thumb and forefinger against the rivet, using both hands, for a few seconds to loosen a bit.

    If that's not it I'm not sure.
     
  4. mpre53

    mpre53 Well-Known Member

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    My thoughts are that it would happen more often than every third crank, if it were a bad pulley tooth. Sounds more like a bad/stiff link, and it skips when that particular link hits the pulley.

    But I'm no mechanic. /img/vbsmilies/smilies/wink.gif
     
  5. daveryanwyoming

    daveryanwyoming Well-Known Member

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    Yeah you guys are likely right, that matches up better with the every three crank revolutions thing.

    -Dave
     
  6. mdgeorge

    mdgeorge New Member

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    Thanks for replies. Issue now sorted as the connecting pin when reconnecting the chain together was sticking out ever so slightly and was causing a stiff link
     
  7. daveryanwyoming

    daveryanwyoming Well-Known Member

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    Good job tracking that down. You're lucky you didn't snap the chain during a hard acceleration with a connecting pin not completely driven flush.
     
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